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Clock Basics Slide 11

Jitter is the most commonly used measurement of clock performance and it is defined as any deviation of the actual signal edge from the ideal edge. The three most common types of jitter are period, cycle to cycle, and phase jitter. Period jitter is the difference between the actual cycle time and the ideal period defined as 1/f. This is also referred to as short term jitter. Cycle to Cycle Jitter is the variation in the cycle time between consecutive cycles over a random sample of cycle pairs. It is also referred to as adjacent cycle jitter. Phase Jitter, also known as long term jitter, is the integration of the phase noise plot in time over a specified band of frequencies.

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